Although not strictly for forensic purposes, '''visualization tools''' such as the ones discussed here can be very useful for visualizing large data sets. As forensic practitioners need to process more and more data, it is likely that some of the techniques implemented by these tools will need to be adopted.

* [http://public.kitware.com/VTK/ The Visualization Toolkit] - C++ multi-platform with interfaces available for Tcl/Tk, Java and Python. Professional support provided by [http://www.kitware.com/ Kitware].

* [http://processing.org/ Processing.org] - A new language for doing graphics and visualization.

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====Tree Maps====

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[http://www.cs.umd.edu/hcil/treemap-history/index.shtml Treemaps] are a visualization technique developed at the University of Maryland for visualizing large amounts of multi-dimensional data. There is a GPLed implementation of treemaps written in C. You can find a copy of in it:

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* [http://www.derlien.com/ Disk Inventory X]

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* [http://kdirstat.sourceforge.net/ KDirStat]

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===Graph Drawing Applications===

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* [http://www.graphviz.org/ Graphviz] - Originally developed by the [http://public.research.att.com/areas/visualization/ AT&T Information Visualization Gorup], designed for drawing connected graphs of nodes and edges. Neato is a similar system but does layout based on a spring model. Can produce output as [[PostScript]], [[PNG]], [[GIF]], or as an annotated graph file with the locations of all of the objects &mdash; ideal for drawing in a GUI. Runs from the command line on [[Unix]], [[Windows]] and [[Mac]], although there is also a [http://www.pixelglow.com/graphviz/ MacOS GUI version].

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* [http://graphexploration.cond.org/ Guess: The Graph Exploration System] - Originally developed at HP, this is a large Jython/Java-based system that you can use for building your own applications. Distributed under GPL.

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* [http://sourceforge.net/projects/ivc/ InfoVis Cyberinfrastructure] - Another graph drawing system written in Java.

* [http://www.netminer.com/ NetMiner] - "One of the most comprehensive and usable software tools for Social Network Analysis in the world." Runs on Winodws, with a Linux version under development. $35 for "Express" student version, $250 for "Professional" student version, $950 for "Normal" "Professional" version.

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* [http://www.analytictech.com/ucinet.htm UCINET] - A comprehensive package for the analysis of social network data as well as other 1-mode and 2-mode data.